About Torque, Shaft Power & Shear Stress Calculator
Calculate rotational moment of force (torque in N·m and lb-ft), transmitted mechanical power in Kilowatts and Horsepower, and torsional shear stress on solid drive shafts with Tresca/von Mises yield safety factors.
Key Capabilities & Features
- Calculates torque from tangential force (N) and moment arm radius (m)
- Simultaneous conversion between SI Newton-meters (N·m) and Imperial foot-pounds (lb-ft)
- Transmitted mechanical power computation in Kilowatts (kW) and Horsepower (HP)
- Calculates solid shaft torsional shear stress (τ = 16T / πd³)
- Evaluates structural shaft integrity against material yield limits
How to Use Torque, Shaft Power & Shear Stress Calculator
Input Force & Radius
Specify the applied force in Newtons and lever arm length in meters.
Enter Rotational RPM
Set shaft operating speed in revolutions per minute.
Inspect Power & Shear Stress
Review output torque, horsepower rating, and shaft torsional safety factor.
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100% client-side mechanical engineering calculations.
Frequently Asked Questions
How is torque converted into mechanical power?
In SI units, Power (kW) = (Torque in N·m × RPM) / 9549. In Imperial units, Horsepower (HP) = (Torque in lb-ft × RPM) / 5252.
What causes drive shaft torsional failure?
When torsional shear stress τ = 16T / (π · d³) exceeds the material allowable shear limit (typically ~58% of tensile yield strength), the shaft experiences plastic deformation or fatigue shearing.